1 // Copyright 2016 the V8 project authors. All rights reserved. 2 // Use of this source code is governed by a BSD-style license that can be 3 // found in the LICENSE file. 4 5 #include "src/builtins/builtins-utils.h" 6 #include "src/builtins/builtins.h" 7 #include "src/conversions.h" 8 #include "src/counters.h" 9 #include "src/objects-inl.h" 10 11 namespace v8 { 12 namespace internal { 13 14 // ----------------------------------------------------------------------------- 15 // ES6 section 21.1 ArrayBuffer Objects 16 17 // ES6 section 24.1.2.1 ArrayBuffer ( length ) for the [[Call]] case. 18 BUILTIN(ArrayBufferConstructor) { 19 HandleScope scope(isolate); 20 Handle<JSFunction> target = args.target(); 21 DCHECK(*target == target->native_context()->array_buffer_fun() || 22 *target == target->native_context()->shared_array_buffer_fun()); 23 THROW_NEW_ERROR_RETURN_FAILURE( 24 isolate, NewTypeError(MessageTemplate::kConstructorNotFunction, 25 handle(target->shared()->name(), isolate))); 26 } 27 28 // ES6 section 24.1.2.1 ArrayBuffer ( length ) for the [[Construct]] case. 29 BUILTIN(ArrayBufferConstructor_ConstructStub) { 30 HandleScope scope(isolate); 31 Handle<JSFunction> target = args.target(); 32 Handle<JSReceiver> new_target = Handle<JSReceiver>::cast(args.new_target()); 33 Handle<Object> length = args.atOrUndefined(isolate, 1); 34 DCHECK(*target == target->native_context()->array_buffer_fun() || 35 *target == target->native_context()->shared_array_buffer_fun()); 36 Handle<Object> number_length; 37 ASSIGN_RETURN_FAILURE_ON_EXCEPTION(isolate, number_length, 38 Object::ToInteger(isolate, length)); 39 if (number_length->Number() < 0.0) { 40 THROW_NEW_ERROR_RETURN_FAILURE( 41 isolate, NewRangeError(MessageTemplate::kInvalidArrayBufferLength)); 42 } 43 Handle<JSObject> result; 44 ASSIGN_RETURN_FAILURE_ON_EXCEPTION(isolate, result, 45 JSObject::New(target, new_target)); 46 size_t byte_length; 47 if (!TryNumberToSize(*number_length, &byte_length)) { 48 THROW_NEW_ERROR_RETURN_FAILURE( 49 isolate, NewRangeError(MessageTemplate::kInvalidArrayBufferLength)); 50 } 51 SharedFlag shared_flag = 52 (*target == target->native_context()->array_buffer_fun()) 53 ? SharedFlag::kNotShared 54 : SharedFlag::kShared; 55 if (!JSArrayBuffer::SetupAllocatingData(Handle<JSArrayBuffer>::cast(result), 56 isolate, byte_length, true, 57 shared_flag)) { 58 THROW_NEW_ERROR_RETURN_FAILURE( 59 isolate, NewRangeError(MessageTemplate::kArrayBufferAllocationFailed)); 60 } 61 return *result; 62 } 63 64 // ES6 section 24.1.4.1 get ArrayBuffer.prototype.byteLength 65 BUILTIN(ArrayBufferPrototypeGetByteLength) { 66 HandleScope scope(isolate); 67 CHECK_RECEIVER(JSArrayBuffer, array_buffer, 68 "get ArrayBuffer.prototype.byteLength"); 69 70 if (array_buffer->is_shared()) { 71 THROW_NEW_ERROR_RETURN_FAILURE( 72 isolate, NewTypeError(MessageTemplate::kIncompatibleMethodReceiver, 73 isolate->factory()->NewStringFromAsciiChecked( 74 "get ArrayBuffer.prototype.byteLength"), 75 args.receiver())); 76 } 77 // TODO(franzih): According to the ES6 spec, we should throw a TypeError 78 // here if the JSArrayBuffer is detached. 79 return array_buffer->byte_length(); 80 } 81 82 // ES6 section 24.1.3.1 ArrayBuffer.isView ( arg ) 83 BUILTIN(ArrayBufferIsView) { 84 SealHandleScope shs(isolate); 85 DCHECK_EQ(2, args.length()); 86 Object* arg = args[1]; 87 return isolate->heap()->ToBoolean(arg->IsJSArrayBufferView()); 88 } 89 90 } // namespace internal 91 } // namespace v8 92
